One of the evidences that Barack Obama had not been in the Senate long enough when he was elected President in 2008 is his choice of Joe Biden as a running mate. Mr. Obama had not hung around the Democratic cloakroom long enough to learn what all the Democrats knew--that Joe Biden is prone to make the most foolish statements in public. There's a good reason why Joe Biden was a U.S. Senator for 36 years and even his fellow Democrats never suggested making him their Majority Leader.
When Joe Biden went to Moscow in 1979, he told the Soviets the U.S. cared about arms control more than about human rights. As a result, we got no arms control, and thousands of Russians were thrown into the Gulag.
In 1988, he ran around the country running for president, giving an amazingly eloquent speech to Democratic audiences. He earned new respect from all hearers--until they learned that he had cribbed the entire speech from British Labour Party Leader Neil Kinnock. Plagiarism can get you suspended if you are Fareed Zakaria of the media. For Joe Biden, plagiarism got him promoted.
There's a wonderful story about President Theodore Roosevelt going down in the first submarine. Reporters lined the pier. "Please, Mr. President, don't go down unless you take Vice President Fairbanks with you!" Now we know why we've never seen President Obama in a submarine.